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08/25/2010 | Marilyn Sigman, Alaska SeaGrant/MAP
Tags: Climate Change, Alaska Native Perspectives on Climate Change, Arctic Ocean, Traditional Knowledge Changes in Alaska Marine Ecosystems
Mary Pete, recently appointed to the U.S. Arctic Research Commission to represent indigenous perspectives and to focus on anthropology, subsistence, and education; testified at a Senate field hearing on the implications for federal resources and local communities of a changing Arctic in Barrow on August 29, 2010.  MORE >>

07/23/2010 | Marilyn Sigman, Alaska SeaGrant/MAP
Tags: Polar bear, Climate Change, Changes in Alaska Marine Ecosystems, Changing Species Distributions
Local residents and biologists were startled by the sighting of a polar bear near the village of Emmonak at the mouth of the Yukon River. There have been other sightings of polar bears on the Yukon-Kuskokwim Delta this summer compared to only a few that have been seen this far south every three to five years  MORE >>

07/23/2010 | Marilyn Sigman, Alaska SeaGrant/MAP
Tags: Climate Change, Changes in Alaska Marine Ecosystems, Ocean Acidification
In its recent ocean news update, SeaWeb summarized several articles from the June 18, 2010, issue of Science related to the effects of ocean warming. Absorption of carbon dioxide and heat - the scale and pace of change in chemical and physical conditions have set in motion a wide range of biological responses, including: **Changes in the distribution, abundance, and productivity of phytoplankton communities **Acidification and stratification of the ocean **Decrease in annual productivity by at least six percent since the early 1980s with nearly 70 percent of this decline occurring in the polar and subpolar regions **Rising temperatures in polar regions are reducing ice thickness and extent, removing habitat for species from polar bears to penguins and fundamentally altering marine ecosystems. **Warming waters are prompting a poleward shift in the distribution of a number of species, resulting in an increase in the number of invasive or exotic species, including pathogens. (Hoegh-Guldberg and Bruno) **Ocean pH is lower now than it has been in 20 million years. (Kerr) **The rate of ocean pH is unprecedented, a factor of 30 to 100 times faster than changes in the recent geological past, and perturbations will last many centuries to millennia. (Doney) **Some marine species may benefit from higher CO2 levels such as phytoplankton, seagrass, and seaweed species that increase their rate of photosynthesis. (Doney)  MORE >>